Upload mere than 7 bytes (block mode)

[waszniowski]

I am able to successfully upload up to 7 bytes (standard mode) via blocking call of

Code: Select all

msg = new byte[20];
result = XCPApi.Upload(m_XcpSession, 7, msg, (ushort)msg.Length);

Attempt to upload more bytes in block mode, however, returns out of range err without sending any message to bus.
How can I upload in block mode?

Thanks
Libor

[K.Wagner]

Hello,

you can not request more than 7 bytes with this function. The function doesn't support blocking mode.

[waszniowski]

Thank you very much for your fast response.
Is there another way how to implement block mode upload (Command Code = 0xF5, Number of data elements > 7)?

[K.Wagner]

Hello again,

just a clarification: The API functions cannot handle more than MAX_CTO for an answer. When you use any function and gives a buffer for a CTO, the function will fail if the result may be bigger than 8 bytes.

Try using the function asynchronously, i.e. set the "ctoBuffer" on the function call to NULL. Then, the upload request should get out and you will receive more CTO packages that can be read using the function XCP_DequeuePacket. More information regarding reading asynchronously can be read in the help at chapter "Introduction/About PCAN-XCP/Synchronous vs. Asynchronous Package Receiving"

I hope this help,

[waszniowski]

Thanks you very much - it works.
What is surprising for me is, that

Code: Select all

result = XCPApi.Upload(m_XcpSession, num);

returns error code

Code: Select all

XCP_ERR_CMD_SYNCH

(but there is no corresponding message from slave on the bus). If I ignore this error code, I can successfully read data via XCPApi.DequeuePacket(...).

[K.Wagner]

Hello,

you are right. This is a small bug. Just ignore this error by now. We will fix this in the next version.

Thanks for bringing this into our attention.